water rise or decline. Collection of the characteristic data of these sources which could impact the site
shall be performed. The impact of these hydrologic hazards shall be defined with respect to their proximity
of the site and its elevation.
B. The extent of the data to characterize potential sources of flooding is dependent upon the
performance categories of the structures. For sites containing facilities with SSCs in Performance
Category 1 or 2, it is sufficient to utilize results of previous site-specific probabilistic flood hazard studies
(e.g., McCann and Boissonnade, 1988a, 1988b, and 1991), if available, or to utilize information provided
in the flood insurance studies by Federal Emergency Management Agency (FEMA) and any other reliable
hydrology resource as listed in Paragraph 5.3.1 .F.
C. For sites containing facilities with SSCs in Performance Category 3 or 4, and for which no site-specific
probabilistic flood hazard studies have been performed in accordance with specifications in
DOE-STD-1023-95, site-specific characterization criteria are provided in the following paragraphs.
5.3.1 Hydrological Data Collection
A. The location, size, shape, and other hydrologic characteristics of streams, lakes, shore regions, and ground
water environment influencing the site shall be described. In addition, there shall be a quantitative
description of existing and planned water control structures that may influence the hydrologic conditions
at the site.
B. The hydrologic events which are potential sources of flooding for the site should be determined. The
hydrologic events considered shall include:
Precipitation, snow melt, debris jams, ice jams, rapid sedimentation
Earthquake, flood, volcano, landslide, static failure
Levee or Dike Failure
Earthquake, flood, static failure, upstream dam failure,
Precipitation, ponding, drainage capacity
Precipitation, ponding, flooding, drought and over pumping
Fluid extraction (e.g., Gulf Coast, Sacramento Valley, etc.,)
C. The necessary hydrologic event data shall be collected to determine the flood sources and used to evaluate
potential flood hazards at the site.
D. This data collection process is iterative. Initial data requirements focus on the need to identify potential
sources of hydrologic hazards to the site. For each flood hazard a summary of hazard